I think it's a kind of interesting addition to the game. Final Fantasy titles on Nintendo consoles originally had "Inferno" is Ifrit's signature attack because they would root out instances of religion from video games. When Final Fantasy went to PSX, it became much more common to see it translated as "Hellfire." Ultimately, I think it's pretty cool we have both- not unlike the Milleuda/Miluda situation for a FATE in Southern Thanalan. It's kind of a little Easter Egg.